[Pdns-users] Recursor doesn't wait long enough for the reply

Laszlo Toth laszlo.toth at linguamatics.com
Thu Sep 1 10:17:13 UTC 2016


I have a problem with pdns-recursor. It looks like if the recursive 
forwarder (that is set with the forward-zones-recurse parameter) is 
taking longer than usual to respond the Recursor stops waiting for it. 
My experiment showed this is 1 second. Is there a way to configure this 
timeout? I have to use a couple of domains where the TTL is 30 (or 60 
seconds) and their authoriative servers are very slow.

The error looks like this in tcpdump:

13:56:18.082578 IP pdns.server.local.30044 > dns1.resolv.to.domain: 
39835+ A? example.com. (42)
13:56:19.737475 IP dns1.resolv.to.domain > odns.server.local.30044: 
39835 1/0/0 A (58)
13:56:19.737511 IP pdns.server.local > dns1.resolv.to: ICMP 
pdns.server.local udp port 30044 unreachable, length 94


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